/*
 * Copyright 2000-2015 JetBrains s.r.o.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.intellij.util.containers;

import org.jetbrains.annotations.NotNull;

import java.lang.ref.ReferenceQueue;
import java.lang.ref.WeakReference;
import java.util.Map;

/**
 * @deprecated use {@link ContainerUtil#createWeakKeyWeakValueMap()} instead
 */
@Deprecated
public final class WeakKeyWeakValueHashMap<K, V> extends RefKeyRefValueHashMap<K, V> implements Map<K, V> {
    public WeakKeyWeakValueHashMap() {
        super((RefHashMap<K, ValueReference<K, V>>) ContainerUtil.<K, ValueReference<K, V>>createWeakMap());
    }

    private static class WeakValueReference<K, V> extends WeakReference<V> implements ValueReference<K, V> {
        @NotNull
        private final RefHashMap.Key<K> key;

        private WeakValueReference(@NotNull RefHashMap.Key<K> key, V referent, ReferenceQueue<? super V> q) {
            super(referent, q);
            this.key = key;
        }

        @NotNull
        @Override
        public RefHashMap.Key<K> getKey() {
            return key;
        }
    }

    @NotNull
    @Override
    protected ValueReference<K, V> createValueReference(@NotNull RefHashMap.Key<K> key,
                                                        V referent,
                                                        ReferenceQueue<? super V> q) {
        return new WeakValueReference<K, V>(key, referent, q);
    }
}
